Of berlin



lNIvnLsV .Ioni sorter BERLIN, WISCONSIN.

Letters Patent No. 75,167, dated rifare/i 3, 1868.

IMPROVEMENT IN Machines ron BORING Huss.

@In tlgthule referrer in iu tlgcsc lcttits ijzitentf mit milling pitt tf tige smut.

TO'ALL WHOM ITl MAY CONCERN:

Be it known that I, NIELS JOHNSON, of Berlin, in the county of Green Lake, and in theStatc of Wisconsin, have invented vcertain new and useful Improvements n.Hub-Boring Machines; and do hereby declare that the following is a full, clear, and exact description thereof', reference being had'to accompanying drawings, and to the letters of referencemarked thereon. n

In the annexed -drawings, making partei' this specification, A and A represent two cast-nuetal heads, which can be made either annular or triangular, or any other suitable shape, and which, when in use, are to be firmly fastenedin a lathe or other machine where hubs can-be bored. I

The head, A, has an annular opening cut through its centre, and in this openingv is fitted a. disk or wheel,

G. This diskisso secured in the opening that, although it is allowed to revolve freely, it cannot be removed without moving the devices which hold itin place.

' The disk G is provided with a Aslot,which is a little less in length thau'the diameter'of the disk; and, in* f this slot is placed a slide, F, said slide having tongues or ways, which take into grooves in the sides ofthe slot. The slide has two ears or ings on its outer face. Asst-screw, S, passes through one of these'ears, while the end of a set-screw, R, buts against the other, when desirable, for stationing the slide at any particular point.-

Ia the .centre of the slide F is fitted a square box, d, which has an annular opening through-.its centre to receive one end of the feed-shaft B. That end of the feed-shaft which passes through this box is provided with a longitudinal groove; and a. pin, a,upon the box cl, takes into this groove, in order to keep the shaft from revolving in the box. lThe box is not iittedtightly in the slide, but so that it will play a little,lit having trun nions on two opposite sides, which t in suitable holes or recesses in the slide. I

C C represent threeilanges ou the inner face of head vA, and D D D represent three sliding clamps, whichlie'in grooves in the inner face of the head. E E represent set-screws, which ,pass through the flanges and into the clamps. The clamps are equidistant from each other, and are moved toward or from the centre of disk F bymeans of the set-screws E.

The outer end of the set-screw S i's made square', and receives upon it a pinion, S; with a square hole through its centre, made to t the screw. Y H I- Upon-theouter face of the head, A, are three pins, c c, which are cquidistant apart, and are so placed that, --when the disk G revolves, the pinion S may be madel to pass over them, and, asit passes, each pin causes the 4pinion'to partially-revolve one tooth, thus slightly moving the slide F, and, with it, the feed-shaft B.

A represents the other head, which has the ilanges M M M cast uponits inner face. K represents a set-screw, passing through one of the flanges M, and Valso through a lug or ear on a double rack-bar, J. 4

On the inner end of the rack-bar is formed `a clamp, Jg' and upon each side of said bar are pivoted the piniens L L, in such position that they mesh into its teeth. Y

By revolving the set-screw K', the raelibar J with its clamp is moved toward or from the centreof head A', and, at the same time, the pinions are caused to revolve. H H represent two bars, which are provided on their inner edges, near one end, withteeth to correspond with those of the pinious L L. These bars H have their other ends inadetria1igula1, as seen. The backs of these bars rest and work against two ofthe lugs M M, while the hypothonuse ofthe triangle works against and operates the sliding clamps I'I.

Whenv the pinions L revolve in one direction, they draw the bars H 'H endwise, causing-them, with their triangular ends, to move the clamps I I inward. '.lhc clamps are moved outward by a reverse motion of the bars.- N represent rests for the inner ends of the'clamps. Theseclamps slide in grooves in the inner face of the head, similarly to those before mentioned inv-head A. l i I m nfl' represent concentric metallic rings, each having trunnions. 'lhe outer or larger ring, m, is fitted-in i an annular opening at the centre of the head, A. The trnnnions of' these rings are so placed that the inner ring plays in a universal joint. i

Through the centre of the inner ring, 7', is an` opening to receive the feed-shaft;l ,and in this opening a 7,* thread is cut, to it the threads of a screw upon the shaft B. Y

P, seen in Figure 1 in dotted line, represents a curved knife or cutter, which is secured to the shaft Thehub Q isA clamped in the two heads A A, and the shaftB is inserted in an opening in the centre ofthe hub. When the shaft B'is revolved, its screw causes it to pass through the hub, carrying with it the-knife, which outs the opening as large as necessary.

Either a straight or a tapering opening can be out through the-hub with this machine. `When the parts arev all properly centred and made rigid, the shaft will cut with its knife a straight opening. Should a tapering one be required, the slide F is carriedlby the set-screw S so that the shaft is out of centre. The pinion S is then set so it will catch, as it revolves, upon the pins e e. Then, when the shaft B revolves, the knife cuts eeeentrieally, and, at each revolution, the said shaft is moved by set-screw .S near the cent-re ofthe head. Asiv the shaft approaches the centre of the head, the taper diminishes.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is^ The bars HH, clamps I and J, pinions LII, rack-bar J, and .set-screw K, for forming a universal clamp for hubs, substantially as set forth.

In testimony that I claim the foregoing, I havefhereunto set. my hand, this 3d day of December, 1867. NIELS JOHNSON.

Witnesses:

JOHN YOUNG, STEPHEN V. HACKETT. 

